Netscape error: "The security library has experienced an error."

[Mark Phillips <mark@ist.flinders.edu.au>]

I am trying to download some software from the Australian Tax Office,
but when I clicked on the button to download, it gave the error:

  The security library has experienced an error.
  You will probably be unable to connect to this site securely.

Does anyone know what's wrong?  I am using Netscape Navigator 4.73.  

I looked to see if there were any security settings I could play with,
but couldn't find any under "preferences" or anything else for that
matter.

I know my brother successfully downloaded the same software, but he
might have used an older version of netscape.  I would ask him about
it except he is on his honeymoon!

Thanks in advance for any suggestions,

Mark.

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        "They told me I was gullible ... and I believed them!"